Chromecast: adds Android implementation of CastSysInfo.

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastSysInfoAndroid.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chromecast.shell;
+
+import android.os.Build;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Java implementation of CastSysInfoAndroid methods.
+ */
+@JNINamespace("chromecast")
+public final class CastSysInfoAndroid {
+    private static final String TAG = "CastSysInfoAndroid";
+
+    @CalledByNative
+    private static String getSerialNumber() {
+        return Build.SERIAL;
+    }
+}